<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>属性选择器</title>
    <style>
        [type]{
            color: red;
        }

        [type=number]{
            color: green;
        }
    </style>
</head>
<body>

用户名:<input type="text" ><br>
密码:<input type="password" ><br>
邮箱:<input type="email" ><br>
年龄:<input type="number" ><br>
<button type="button">提交</button>

</body>
</html>